Rotary pressure-blower.



P. D.-BREWSTER. ROTARY PRESSURE BLOWER.

APPLICATION FILED SEPIZZQ, 190s.

Patented 061;. 4, 1910.

2 SHBETS-SHEET l,

P. D. BREWSTER.

ROTARY PRESSURE BLOWER.

APPLICATION FILED SEPT. 29. 190s.

971,660. Patented 00t.4,1910.

Y A 2 SHEETS-SHEET 2.

UNITED -sTATEs PATENT oEEioE.

i PERCY D. BREWSTER, OF EAST ORANGE, NEW JERSEY, ASSIGNOR TO BREWSTER ENGINEERINGCO., 0F HOBOKEN, NEW JERSEY, A CORPORATION OE NEW JERSEY.

ROTARY PRESSRE-BLQWER.

Specification ofLetters latent. n Patented-Oct. 4:, 1910.

4Application filed September 29, 1906, l Serial No. 336,769.

To all whom it may concern. i l

Be it known that I, PERCY D. BnEws'rEinal citizen of the United States, of Np. 301 IVih liam street, East Orange, county of Essex, and State of New Jersey, have invented certain new and useful Improvements'in Rofully described and represented in the following specification and the accompanying drawings, forming a part of the same.

The object of the present invention is to A improve the efficiency vof rotary blowers in piston-drum vao piston-heads revolve which drums rotate in contiguity, 'and piston-heads or ridges upon one of the drums engage with grooves or sockets in the opposite drum. The contact.- of the drums forms a cut-oil' for the air and forces it from the piston cylinde`r. In such construction, the within a casing and drive the air before '.themfand the smaller the piston-drum in proportion to the size of the casing, thegreater is the volume of air delivered for each rotation.

In my construction. the grooved drum, which is termed the 'a utment-drum herein, is made ifty per cent. larger than the and furnished with three of the grooves or sockets to engage the pistonheads,"and the drums are connected by gearwheels of pitch diameter in proportion to their respective diameters; so that the abutment-drum revolves at vonly two-thirds the speed of the piston-drum. By making the abutment-drum larger, thegrooves or sock ets can be out deeper in' the drumwithout weakening its structure, and the pistonheads can be made longer, and the pistoncylinder (in the casing) larger in propor-v tion to the diameter ofits drum, than where a two-'grooved abutmentfdr'um' is used which is necessarily of the same diameter as the mize the construction, 'thechamber or cylinder (in the casing) 'for the abutment-drum is not bored, but thev Contact ofsuch drum withthe casing is effected by seats which are made by casting soft metal in grooves in the ',drum.

In the annexed drawing, Figure 1 is an;- end elevation of the blower with the coverto u ill the abutment-drum.

ya g thus'embracey yopen ldirectly into the arrows marked therein in Fig. 3.

the gear-guard removed; Fig. 2 is a side elevation showing the blower inlet; Fig. 3 is a .vertical section across *the middle of such inlet on Fig'. 2; Fig. 4: is a horizontal section across the edge of the casing at they center of the inlet; Fig.v 5 is a side elevation of the piston-drum and driving-shaft; Fig. 6 -is a side elevation of the abutment-drum and its shaft; Fig.' 7 is a vertical section, where hatched,` at the centerline of Fig. l, the bedbeing omitted; Fig. 8 is a similar section looking toward `the outlet, with the heads andxdrums'removed -to show the outletv passage; and. Fig. 9 is a similar section looking toward the inlet.

The casing a is provided at the ends with cylinder headsva and a2, and with twin parallel boresl) and c. Thesey bores embrace each only about one-halfofj a cylinder, .and may advantageously be a littleover 180 degrees, to maintain contact with the rotating parts. Shafts b ings in the heads at' the centers of the bores. The'casing has inlet el upon one side and outlet e upon the opposite'side. The bore b is machine-finished on the lower half, that is, at one side of the inlet and outlet, and the bore c is made a little larger than the abutment-drum f and provided with one or more longitudinal packings g, g,covering a space equal to the width of the abutment-sockets h The packing strips each of the abutment sockets in turn as they move past the packs `ings, and .prevent the passage of air past the packings as effectively as a single wide strip. A piston-drum z' lis shown vwith two pistonheads. j, and the abutment-drum with three vabutment-sockets z.. No -valves are employed; but the inlet and outlet of the blower bore in which the piston-drum revolves.' i The inlet and outlet enter the bore l) a little above or at one side of the centerline so that both the pistonheads may be in contact with -the bore at the same time, the spaces'containing the fluid which is impelled to the outlet e as ther piston-drum and abutment-drum revolvel in opposite directions. or in the direct-ion of the The socketsh aremadesopas to clear the piston-heads in order to avoid finishingtheir interior, and eachsocket is provided along one edge Ywith a finished seat k in order to match the'corresponding finished face ofthe piston-head.l

and c arefitted to bear- The conti'guity is maintained by the gears keeping the rear curve-of the piston-head contiguous with the rear seat ofthe socket, and any wear in the gears only serves to increase. the (clearance `and does not 'cause knock. The shafts b and c are connected out-side the"'liead 7c by ears b2, 02, to revolve at different speeds,,e1ther the forward or backward face of each piston-head (as the part marked j in Fig. 3) being curved to maintain a contiguous relation with the seat k of the corresponding piston-socket. y

In building the blowers, itv is. convenient t-o adjust the curved surface of the -pistonhead into close proximity to the seat lo in the abutment-socket by making one of the connecting gears b2 and 02 adjustable on itsshaft. This may be eected in any convenient manner, a means being shown in'Figs. 1 and 7 which permits of very minute adjustment. flat annular flange' Z upon which the gearteeth are cut, anda hub m is secured to the .shaft c and provided with a flange m' `which overlaps the flange Z. Cap-screws n connect the flanges Z and m', being inserted vthrough slotsin the latter to permit of a rotary adj ustinent, and a lug o is formed on the flange j m and two plugs p, at a little distance there- [from upon the flange l, are provided with -set-screws Q extended through the lugs pto the oppositeside of the lug'o's. The hub m `is secured rigidly to the shaft c by key m2,

andthe gear Z22 is secured rigidly to the'shaft bby key 3, and when the teeth of the gears are interlocked, with one of the piston-heads in one of the abutment-sockets, the setscrews g are turned to adjust the abutmentydrum'with the seatl: close to the piston-head.

Anymeans of giving one of the drumsa A `slight peripheral adjustment in relationto:

the other suices to carryk out this part of theinvention. This adjustment also serves to take upanywear of the gears, so as to always maintain a close clearance between the edge of the sockets and the heads. Annular grooves t are shown in dotted lines in Fig. 1

cut'in flanges a? of the casing; andcorre` sponding concentric ribs t are formed on cyli-nder-headsa and a2 which are adapted to lit inthegrooves in the casing;v these insure the exact centering ofthe shafts and The gear-wheel c2 is shown with av produces the desired slight clearance. Bly making the packing-strips narrow, they are cast with great facility and` employ much less of the soft metal,-and form a fluid cutoff as the sockets pass the .packings, as effectively as a'single wide strip. To renew the bearings when worn, I provide ball-bearings formed of separate inner and outer collars,

groovedvto form ball-races and fitted to circular openings in the heads.

v .The drums are shown each fitted at one end to a'taper-se'at t3 upon the shaft secured with the Woodrui key-,and the inner ballrace u is pressed-against the end/of the drum by a nutu, which serve s`also to draw the drum -iirmly upon the taper-seat. The outer. y ball-race m is shown adjustable in the head by means of a screw-collar m fitted4 within the head, and having in practice holes upon its outer side to insert a: spanner for turn-ing it when required, 'as in bicycle ball-bearings. A recess y is shown in, the' endof the drum adjacent to the collare1 to permit the adjustment of the collar, and when such collar is pressed inwardly' ,it leads theA balls in aV vslight-ly differentl track, and moves the balls,

the inner race u, and theV drum, away from the head. The drums 'are .made slightly shorter than the length of the bores in the casing, thus allowing aslight clearance at the ends, and theball-bearinvs are adjusted position so as to hold the drums in a central to run close to the' headsV .without touching the same. The gear-wheels b2 and c2 operate onlyfto rotate the drums in unison, as the abutment-drum offers no resistance to rotation, and the gears may thusbe driven at a higher speed than ifwqrkingfagainst a resistance. e W

At every revolution Vofthe blower, all v'liu-id driven forward by the piston-heads Vis expelled, and a greater eiiiciency isvthusyslei cured than when any' portion'cf the inclosed air remains in delivery ports, and expands into the succeeding'piston-space.,

Owing to the fact that the abutment-druml is materially larger than. the piston-drum,l

lib

the rsockets in the :abutment-drum maybe made very deep 'and the"pistonheads. pro- .v 4jected a correspondingly'great distance from the. iston-drum thus occupies a relatively smal vpart ofthe piston-cylinder and discharges a greater volume ofair at each rotation than if a larger drum were used in thesame cylinder.

I hereby disclaim the mere use of a pistondrum having longitudinal piston-heads, and anV abutment drum having longitudinal sockets to coperate with such piston-heads,

as my invention consists inthe particular constructions claimed herein. -Havingthus set forth the nature of the invention what is claimed hereinis.:

1. A rotary pressure'blower havin a casing `r's'rith twin boresv and `in1e.t"= a'1 i outlet lul-fousl t smailer drum having ,fj-fpositely disposed similar piston-heads with vunbroken surface and twoto three revolving the drums continu- -'than Asuch piston heads and hav-ing .'Ovnly' 15, fiston 4 is vfreely discharged to the .the easing. v ,12,1Apressure-blower having a casing with twin hores- Vonly 2'0. iniShed, vland v'an inletand outlet opening "into vthe-casing upon opposite sides at the' junction of t0- 'qabutmentso'ekets tt'ed. tothe piston-heads, .the shell-fof such abutment-drum being fitted loosely-to the unfinished bore, l,bore-3 havin oiitletopeninv of' the easing,A and a longitudi-- z na-l' .packing rotate.` within the said bores, the drumsv h-z'wing.` diameters 4'to r the casing embracing more than one-half` the v",.periphe'ry gportionof 4 atfthe-same,peripheral velocity, the smaller drum' having two v .disposed similar piston-heads with unbroken 'surface each .'larg'er bore,

opposite sides two drums arthe two to three, gears in the proportion of at -the vsame 'peripheral velocity, the

two longitudinal opfinished upon one side one edge finished and fitted to the side ofthel head, whereby the airin said sockets outlet opening. of

one "of which is machine such bores, two drums arranged i in the proportion of two three, contiguous peripheral surfaces of ofl each drum, gears in the pro- I two tothreerevolving the drums I longitudinal oppositely :having its apexfitted to such the )larger Adrum having three the unnished htwo grooi'fes g2 adjacent to' they formed. oftwo soft metal strips" of the bores, Aa piston-drum havin@ pistonconcenheads and mounted on fa shaft iitted agear-wheel attrically in the other bore,l

tachedvrigidly to one-of the Vhuh to the other shaft, a ring-gear havin th such hub and meshing wit i the rigidly attached gear,A and lugs and setscrews adapted to adjust the ringthe-hub to set the piston-heads and soc ets in contigui'ty with one another.

I 5. A rotary pressure blower havin ing wi openin at the Junction lranged-to rotate drums havi 2 to 3, gears in the volving the' drums peripheral velocity, two longitudinal piston-heads, an three longitudin connection w1 havingv at least one e V In testimony w my hand in the presence o shafts, and

aca

of suchv bores, twodrums a gstte'd to` .tlielgroovesg'. and separated' witnesses, i, 'b'yfa ldistance at .least equal to the .width of l PERCY D. BRIWVSIER.v tlie'socke'ts, in`theabutment,'drum. Witnesses: Y

rotar pressure blower having two *LILLEE .i contiguousrums .vprovide d,f respectively, i THOMAS S. CRANE.

letterati-'aant N65 '9M-,Geoff "a ,new Sentence;

Remy Pr'esslupe-'Blew'ia Y '1tA certitied .that inj-iettersPateutNo. 971,660, granted October' 4,1910., `l upon-the application' -ofiPer'cy Brewster, .of East Jrange, New'v Jersey, vjvfor au attuali equirig Offre/@tin .as renews: Pag l2, flin 116i fief 'the'. @6mp-@Und Ward stoned/wmf should be inserted, making l"andltliat thesaidLetters' Patent should he read with this correction therein ',.that'the ysame 'may conform to the record.' ofl the case the PaftentOtliee.

-- Y. E; MOORE,"

relation .tothe other, to adv -hea-ds properly to the abutn-heads and abutment-sockets, drums to rotate them aving a casing with opposite heads, an abutment -fonly, and the larger drum having threelon-` Vdrum provided with abutment-socketshaving .gitudi'nalabutment-sockets materiallyl wider a shaft mounted 1n the heads and fitted to one gear u on th twin bores and inlet an outlet into the casing upon opposite sides within the said bores, the ng diameters in the proportion of vproportionjof` 2 to 3 recontinuously at the same the smaller drum having oppositely disposed similar d the larger drumhaving; al' abutment sockets wider i vjthan' such piston-heads to clear the same and d'ge finished and ittd to the side-of thepiston-head, as set forth.v

hereolI have hereunto setl two subscribing lul-fousl t smailer drum having ,fj-fpositely disposed similar piston-heads with vunbroken surface and twoto three revolving the drums continu- -'than Asuch piston heads and hav-ing .'Ovnly' 15, fiston 4 is vfreely discharged to the .the easing. v ,12,1Apressure-blower having a casing with twin hores- Vonly 2'0. iniShed, vland v'an inletand outlet opening "into vthe-casing upon opposite sides at the' junction of t0- 'qabutmentso'ekets tt'ed. tothe piston-heads, .the shell-fof such abutment-drum being fitted loosely-to the unfinished bore, l,bore-3 havin oiitletopeninv of' the easing,A and a longitudi-- z na-l' .packing rotate.` within the said bores, the drumsv h-z'wing.` diameters 4'to r the casing embracing more than one-half` the v",.periphe'ry gportionof 4 atfthe-same,peripheral velocity, the smaller drum' having two v .disposed similar piston-heads with unbroken 'surface each .'larg'er bore,

opposite sides two drums arthe two to three, gears in the proportion of at -the vsame 'peripheral velocity, the

two longitudinal opfinished upon one side one edge finished and fitted to the side ofthel head, whereby the airin said sockets outlet opening. of

one "of which is machine such bores, two drums arranged i in the proportion of two three, contiguous peripheral surfaces of ofl each drum, gears in the pro- I two tothreerevolving the drums I longitudinal oppositely :having its apexfitted to such the )larger Adrum having three the unnished htwo grooi'fes g2 adjacent to' they formed. oftwo soft metal strips" of the bores, Aa piston-drum havin@ pistonconcenheads and mounted on fa shaft iitted agear-wheel attrically in the other bore,l

tachedvrigidly to one-of the Vhuh to the other shaft, a ring-gear havin th such hub and meshing wit i the rigidly attached gear,A and lugs and setscrews adapted to adjust the ringthe-hub to set the piston-heads and soc ets in contigui'ty with one another.

I 5. A rotary pressure blower havin ing wi openin at the Junction lranged-to rotate drums havi 2 to 3, gears in the volving the' drums peripheral velocity, two longitudinal piston-heads, an three longitudin connection w1 havingv at least one e V In testimony w my hand in the presence o shafts, and

aca

of suchv bores, twodrums a gstte'd to` .tlielgroovesg'. and separated' witnesses, i, 'b'yfa ldistance at .least equal to the .width of l PERCY D. BRIWVSIER.v tlie'socke'ts, in`theabutment,'drum. Witnesses: Y

rotar pressure blower having two *LILLEE .i contiguousrums .vprovide d,f respectively, i THOMAS S. CRANE.

letterati-'aant N65 '9M-,Geoff "a ,new Sentence;

Remy Pr'esslupe-'Blew'ia Y '1tA certitied .that inj-iettersPateutNo. 971,660, granted October' 4,1910., `l upon-the application' -ofiPer'cy Brewster, .of East Jrange, New'v Jersey, vjvfor au attuali equirig Offre/@tin .as renews: Pag l2, flin 116i fief 'the'. @6mp-@Und Ward stoned/wmf should be inserted, making l"andltliat thesaidLetters' Patent should he read with this correction therein ',.that'the ysame 'may conform to the record.' ofl the case the PaftentOtliee.

-- Y. E; MOORE,"

relation .tothe other, to adv -hea-ds properly to the abutn-heads and abutment-sockets, drums to rotate them aving a casing with opposite heads, an abutment -fonly, and the larger drum having threelon-` Vdrum provided with abutment-socketshaving .gitudi'nalabutment-sockets materiallyl wider a shaft mounted 1n the heads and fitted to one gear u on th twin bores and inlet an outlet into the casing upon opposite sides within the said bores, the ng diameters in the proportion of vproportionjof` 2 to 3 recontinuously at the same the smaller drum having oppositely disposed similar d the larger drumhaving; al' abutment sockets wider i vjthan' such piston-heads to clear the same and d'ge finished and ittd to the side-of thepiston-head, as set forth.v

hereolI have hereunto setl two subscribing It is hemlgy-certied that in Letters Patent No. 971,660, granted October 4, 1910, -upon the application of Percy D. Brewster, of East Orange, New' Jersey, for an iuinrovement in Rotary Pressure-Blowersfvqan error apnea'rs ii'llixe printed peciticatdidn requiring correction as folows: Page 2, line 116, after the compound Word pistomdrum apen'od and the words Thepzlvton-dru-m should be inserted, making a new sentence; and that the said Letters Patent should he read with this correction therein that the same may conform to the record of the case in the Patent Office.

Signed and sealed this 25th day of October, A. D., 19410.

[s1-141,] E, MOORE,

. Commissioner qf Patente. 

